1289428 has 12 divisors (see below), whose sum is σ = 2578912. Its totient is φ = 552600.

The previous prime is 1289423. The next prime is 1289429. The reversal of 1289428 is 8249821.

1289428 is an admirable number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1289393 and 1289402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22998 + ... + 23053.

2^1289428 is an apocalyptic number.

It is an amenable number.

1289428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289428 is a wasteful number, since it uses less digits than its factorization.

1289428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46062 (or 46060 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 1289428 is about 1135.5298322809. The cubic root of 1289428 is about 108.8426312535.

The spelling of 1289428 in words is "one million, two hundred eighty-nine thousand, four hundred twenty-eight".